Yes. It is a weird javascript issue which most certainly does not harm anybody's computer, but even after many updates and removals of bugs, it stills pops up. I have been in touch with Drew about 5 times now with exactly this same message.
There are other possibilities for the cause, all which are being addressed,
but going to
http://www.rejectedunknown.com/ WILL --- NOT --- HARM YOUR YOUR COMPUTER!!!
Thanks for keeping us posted. I'm sure Drew has his magic elves tinkering away right now on a solution.